Maybe rather than focussing on angles think about shaving with the blade "almost" flat against the skin. Less scraping involved that way. Of course there are tricky spots that will not allow a blade "flat" to the skin but it may help to rethink your "angles"

Have you read this ?
http://straightrazorpalace.com/fo...-use-care.html
Thanks for the link. In a strange way it makes me feel better about my technique. I have a Prima Klang and a very coarse beard. I am very, very far from being an "expert" with a straight razor but I get a better shave on my cheeks now than I do with my G. Fusion. Though I am pretty sure I will need to learn how to "touch up" a razor much sooner than I was planning.

Adrain, IME it was a matter of feeling awkward and gradually finding what worked for me. Here are some diagrams and descriptions that may be helpful. The menu will show the various parts of the face/neck and how to approach them.

Just keep at it and take you time. Focus on skin stretching with the opposite hand and the blade angle. Sometimes twisting the neck, making facial contortions, filling the cheek with air can help facilatate stretching.
Aw man! I went ahead and tried an XTG pass on my cheeks (went very well... no blood) and as I was shaving I thought that maybe I should try this direction on my chin. I had already done my chin with the Fusion and didn't want to deal with it (I was already 45 minutes into the shave... speed is not my strong suit at this point). Thanks for the link! Was the exact thing I needed.